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1da177e4
LT		 1/*
2 * esp.c - driver for Hayes ESP serial cards
3 *
4 * --- Notices from serial.c, upon which this driver is based ---
5 *
6 * Copyright (C) 1991, 1992 Linus Torvalds
7 *
8 * Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now
9 * much more extensible to support other serial cards based on the
10 * 16450/16550A UART's. Added support for the AST FourPort and the
11 * Accent Async board.
12 *
13 * set_serial_info fixed to set the flags, custom divisor, and uart
14 * type fields. Fix suggested by Michael K. Johnson 12/12/92.
15 *
16 * 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk>
17 *
18 * 03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk>
19 *
20 * rs_set_termios fixed to look also for changes of the input
21 * flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK.
22 * Bernd Anh�pl 05/17/96.
23 *
24 * --- End of notices from serial.c ---
25 *
26 * Support for the ESP serial card by Andrew J. Robinson
27 * <arobinso@nyx.net> (Card detection routine taken from a patch
28 * by Dennis J. Boylan). Patches to allow use with 2.1.x contributed
29 * by Chris Faylor.
30 *
31 * Most recent changes: (Andrew J. Robinson)
32 * Support for PIO mode. This allows the driver to work properly with
33 * multiport cards.
34 *
35 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> -
36 * several cleanups, use module_init/module_exit, etc
37 *
38 * This module exports the following rs232 io functions:
39 *
40 * int espserial_init(void);
41 */
42
43#include <linux/module.h>
44#include <linux/errno.h>
45#include <linux/signal.h>
46#include <linux/sched.h>
47#include <linux/interrupt.h>
48#include <linux/tty.h>
49#include <linux/tty_flip.h>
50#include <linux/serial.h>
51#include <linux/serialP.h>
52#include <linux/serial_reg.h>
53#include <linux/major.h>
54#include <linux/string.h>
55#include <linux/fcntl.h>
56#include <linux/ptrace.h>
57#include <linux/ioport.h>
58#include <linux/mm.h>
59#include <linux/init.h>
60#include <linux/delay.h>
61
62#include <asm/system.h>
63#include <asm/io.h>
64#include <asm/bitops.h>
65
66#include <asm/dma.h>
67#include <linux/slab.h>
68#include <asm/uaccess.h>
69
70#include <linux/hayesesp.h>
71
72#define NR_PORTS 64 /* maximum number of ports */
73#define NR_PRIMARY 8 /* maximum number of primary ports */
74#define REGION_SIZE 8 /* size of io region to request */
75
76/* The following variables can be set by giving module options */
77static int irq[NR_PRIMARY]; /* IRQ for each base port */
78static unsigned int divisor[NR_PRIMARY]; /* custom divisor for each port */
79static unsigned int dma = ESP_DMA_CHANNEL; /* DMA channel */
80static unsigned int rx_trigger = ESP_RX_TRIGGER;
81static unsigned int tx_trigger = ESP_TX_TRIGGER;
82static unsigned int flow_off = ESP_FLOW_OFF;
83static unsigned int flow_on = ESP_FLOW_ON;
84static unsigned int rx_timeout = ESP_RX_TMOUT;
85static unsigned int pio_threshold = ESP_PIO_THRESHOLD;
86
87MODULE_LICENSE("GPL");
88
89module_param_array(irq, int, NULL, 0);
90module_param_array(divisor, uint, NULL, 0);
91module_param(dma, uint, 0);
92module_param(rx_trigger, uint, 0);
93module_param(tx_trigger, uint, 0);
94module_param(flow_off, uint, 0);
95module_param(flow_on, uint, 0);
96module_param(rx_timeout, uint, 0);
97module_param(pio_threshold, uint, 0);
98
99/* END */
100
101static char *dma_buffer;
102static int dma_bytes;
103static struct esp_pio_buffer *free_pio_buf;
104
105#define DMA_BUFFER_SZ 1024
106
107#define WAKEUP_CHARS 1024
108
109static char serial_name[] __initdata = "ESP serial driver";
110static char serial_version[] __initdata = "2.2";
111
112static struct tty_driver *esp_driver;
113
114/* serial subtype definitions */
115#define SERIAL_TYPE_NORMAL 1
116
117/*
118 * Serial driver configuration section. Here are the various options:
119 *
120 * SERIAL_PARANOIA_CHECK
121 * Check the magic number for the esp_structure where
122 * ever possible.
123 */
124
125#undef SERIAL_PARANOIA_CHECK
126#define SERIAL_DO_RESTART
127
128#undef SERIAL_DEBUG_INTR
129#undef SERIAL_DEBUG_OPEN
130#undef SERIAL_DEBUG_FLOW
131
132#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
133#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
134 tty->name, (info->flags), serial_driver.refcount,info->count,tty->count,s)
135#else
136#define DBG_CNT(s)
137#endif
138
139static struct esp_struct *ports;
140
141static void change_speed(struct esp_struct *info);
142static void rs_wait_until_sent(struct tty_struct *, int);
143
144/*
145 * The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE
146 * times the normal 1.8432 Mhz clock of most serial boards).
147 */
148#define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE))
149
150/* Standard COM flags (except for COM4, because of the 8514 problem) */
151#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
152
1da177e4
LT		 153static inline int serial_paranoia_check(struct esp_struct *info,
154 char *name, const char *routine)
155{
156#ifdef SERIAL_PARANOIA_CHECK
157 static const char badmagic[] = KERN_WARNING
158 "Warning: bad magic number for serial struct (%s) in %s\n";
159 static const char badinfo[] = KERN_WARNING
160 "Warning: null esp_struct for (%s) in %s\n";
161
162 if (!info) {
163 printk(badinfo, name, routine);
164 return 1;
165 }
166 if (info->magic != ESP_MAGIC) {
167 printk(badmagic, name, routine);
168 return 1;
169 }
170#endif
171 return 0;
172}
173
174static inline unsigned int serial_in(struct esp_struct *info, int offset)
175{
176 return inb(info->port + offset);
177}
178
179static inline void serial_out(struct esp_struct *info, int offset,
180 unsigned char value)
181{
182 outb(value, info->port+offset);
183}
184
185/*
186 * ------------------------------------------------------------
187 * rs_stop() and rs_start()
188 *
189 * This routines are called before setting or resetting tty->stopped.
190 * They enable or disable transmitter interrupts, as necessary.
191 * ------------------------------------------------------------
192 */
193static void rs_stop(struct tty_struct *tty)
194{
195 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
196 unsigned long flags;
197
198 if (serial_paranoia_check(info, tty->name, "rs_stop"))
199 return;
200
201 spin_lock_irqsave(&info->lock, flags);
202 if (info->IER & UART_IER_THRI) {
203 info->IER &= ~UART_IER_THRI;
204 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
205 serial_out(info, UART_ESI_CMD2, info->IER);
206 }
207 spin_unlock_irqrestore(&info->lock, flags);
208}
209
210static void rs_start(struct tty_struct *tty)
211{
212 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
213 unsigned long flags;
214
215 if (serial_paranoia_check(info, tty->name, "rs_start"))
216 return;
217
218 spin_lock_irqsave(&info->lock, flags);
219 if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
220 info->IER |= UART_IER_THRI;
221 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
222 serial_out(info, UART_ESI_CMD2, info->IER);
223 }
224 spin_unlock_irqrestore(&info->lock, flags);
225}
226
227/*
228 * ----------------------------------------------------------------------
229 *
230 * Here starts the interrupt handling routines. All of the following
231 * subroutines are declared as inline and are folded into
232 * rs_interrupt(). They were separated out for readability's sake.
233 *
234 * Note: rs_interrupt() is a "fast" interrupt, which means that it
235 * runs with interrupts turned off. People who may want to modify
236 * rs_interrupt() should try to keep the interrupt handler as fast as
237 * possible. After you are done making modifications, it is not a bad
238 * idea to do:
239 *
240 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
241 *
242 * and look at the resulting assemble code in serial.s.
243 *
244 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
245 * -----------------------------------------------------------------------
246 */
247
248/*
249 * This routine is used by the interrupt handler to schedule
250 * processing in the software interrupt portion of the driver.
251 */
252static inline void rs_sched_event(struct esp_struct *info,
253 int event)
254{
255 info->event |= 1 << event;
256 schedule_work(&info->tqueue);
257}
258
259static DEFINE_SPINLOCK(pio_lock);
260
261static inline struct esp_pio_buffer *get_pio_buffer(void)
262{
263 struct esp_pio_buffer *buf;
264 unsigned long flags;
265
266 spin_lock_irqsave(&pio_lock, flags);
267 if (free_pio_buf) {
268 buf = free_pio_buf;
269 free_pio_buf = buf->next;
270 } else {
271 buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC);
272 }
273 spin_unlock_irqrestore(&pio_lock, flags);
274 return buf;
275}
276
277static inline void release_pio_buffer(struct esp_pio_buffer *buf)
278{
279 unsigned long flags;
280 spin_lock_irqsave(&pio_lock, flags);
281 buf->next = free_pio_buf;
282 free_pio_buf = buf;
283 spin_unlock_irqrestore(&pio_lock, flags);
284}
285
286static inline void receive_chars_pio(struct esp_struct *info, int num_bytes)
287{
288 struct tty_struct *tty = info->tty;
289 int i;
290 struct esp_pio_buffer *pio_buf;
291 struct esp_pio_buffer *err_buf;
292 unsigned char status_mask;
293
294 pio_buf = get_pio_buffer();
295
296 if (!pio_buf)
297 return;
298
299 err_buf = get_pio_buffer();
300
301 if (!err_buf) {
302 release_pio_buffer(pio_buf);
303 return;
304 }
305
306 status_mask = (info->read_status_mask >> 2) & 0x07;
307
308 for (i = 0; i < num_bytes - 1; i += 2) {
309 *((unsigned short *)(pio_buf->data + i)) =
310 inw(info->port + UART_ESI_RX);
311 err_buf->data[i] = serial_in(info, UART_ESI_RWS);
312 err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask;
313 err_buf->data[i] &= status_mask;
314 }
315
316 if (num_bytes & 0x0001) {
317 pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX);
318 err_buf->data[num_bytes - 1] =
319 (serial_in(info, UART_ESI_RWS) >> 3) & status_mask;
320 }
321
322 /* make sure everything is still ok since interrupts were enabled */
323 tty = info->tty;
324
325 if (!tty) {
326 release_pio_buffer(pio_buf);
327 release_pio_buffer(err_buf);
328 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
329 return;
330 }
331
332 status_mask = (info->ignore_status_mask >> 2) & 0x07;
333
334 for (i = 0; i < num_bytes; i++) {
335 if (!(err_buf->data[i] & status_mask)) {
33f0f88f 336 int flag = 0;
1da177e4
LT		 337
338 if (err_buf->data[i] & 0x04) {
33f0f88f 339 flag = TTY_BREAK;
1da177e4
LT		 340 if (info->flags & ASYNC_SAK)
341 do_SAK(tty);
342 }
343 else if (err_buf->data[i] & 0x02)
33f0f88f 344 flag = TTY_FRAME;
1da177e4 345 else if (err_buf->data[i] & 0x01)
33f0f88f
AC		 346 flag = TTY_PARITY;
347 tty_insert_flip_char(tty, pio_buf->data[i], flag);
1da177e4
LT		 348 }
349 }
350
808249ce 351 tty_schedule_flip(tty);
1da177e4
LT		 352
353 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
354 release_pio_buffer(pio_buf);
355 release_pio_buffer(err_buf);
356}
357
358static inline void receive_chars_dma(struct esp_struct *info, int num_bytes)
359{
360 unsigned long flags;
361 info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
362 dma_bytes = num_bytes;
363 info->stat_flags |= ESP_STAT_DMA_RX;
364
365 flags=claim_dma_lock();
366 disable_dma(dma);
367 clear_dma_ff(dma);
368 set_dma_mode(dma, DMA_MODE_READ);
369 set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
370 set_dma_count(dma, dma_bytes);
371 enable_dma(dma);
372 release_dma_lock(flags);
373
374 serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX);
375}
376
377static inline void receive_chars_dma_done(struct esp_struct *info,
378 int status)
379{
380 struct tty_struct *tty = info->tty;
381 int num_bytes;
382 unsigned long flags;
383
1da177e4
LT		 384 flags=claim_dma_lock();
385 disable_dma(dma);
386 clear_dma_ff(dma);
387
388 info->stat_flags &= ~ESP_STAT_DMA_RX;
389 num_bytes = dma_bytes - get_dma_residue(dma);
390 release_dma_lock(flags);
391
392 info->icount.rx += num_bytes;
393
1da177e4 394 if (num_bytes > 0) {
33f0f88f 395 tty_insert_flip_string(tty, dma_buffer, num_bytes - 1);
1da177e4
LT		 396
397 status &= (0x1c & info->read_status_mask);
33f0f88f
AC		 398
399 /* Is the status significant or do we throw the last byte ? */
400 if (!(status & info->ignore_status_mask)) {
401 int statflag = 0;
1da177e4 402
33f0f88f
AC		 403 if (status & 0x10) {
404 statflag = TTY_BREAK;
405 (info->icount.brk)++;
406 if (info->flags & ASYNC_SAK)
407 do_SAK(tty);
408 } else if (status & 0x08) {
409 statflag = TTY_FRAME;
410 (info->icount.frame)++;
411 }
412 else if (status & 0x04) {
413 statflag = TTY_PARITY;
414 (info->icount.parity)++;
415 }
416 tty_insert_flip_char(tty, dma_buffer[num_bytes - 1], statflag);
1da177e4 417 }
808249ce 418 tty_schedule_flip(tty);
1da177e4
LT		 419 }
420
421 if (dma_bytes != num_bytes) {
422 num_bytes = dma_bytes - num_bytes;
423 dma_bytes = 0;
424 receive_chars_dma(info, num_bytes);
425 } else
426 dma_bytes = 0;
427}
428
429/* Caller must hold info->lock */
430
431static inline void transmit_chars_pio(struct esp_struct *info,
432 int space_avail)
433{
434 int i;
435 struct esp_pio_buffer *pio_buf;
436
437 pio_buf = get_pio_buffer();
438
439 if (!pio_buf)
440 return;
441
442 while (space_avail && info->xmit_cnt) {
443 if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) {
444 memcpy(pio_buf->data,
445 &(info->xmit_buf[info->xmit_tail]),
446 space_avail);
447 } else {
448 i = ESP_XMIT_SIZE - info->xmit_tail;
449 memcpy(pio_buf->data,
450 &(info->xmit_buf[info->xmit_tail]), i);
451 memcpy(&(pio_buf->data[i]), info->xmit_buf,
452 space_avail - i);
453 }
454
455 info->xmit_cnt -= space_avail;
456 info->xmit_tail = (info->xmit_tail + space_avail) &
457 (ESP_XMIT_SIZE - 1);
458
459 for (i = 0; i < space_avail - 1; i += 2) {
460 outw(*((unsigned short *)(pio_buf->data + i)),
461 info->port + UART_ESI_TX);
462 }
463
464 if (space_avail & 0x0001)
465 serial_out(info, UART_ESI_TX,
466 pio_buf->data[space_avail - 1]);
467
468 if (info->xmit_cnt) {
469 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
470 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
471 space_avail = serial_in(info, UART_ESI_STAT1) << 8;
472 space_avail |= serial_in(info, UART_ESI_STAT2);
473
474 if (space_avail > info->xmit_cnt)
475 space_avail = info->xmit_cnt;
476 }
477 }
478
479 if (info->xmit_cnt < WAKEUP_CHARS) {
480 rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
481
482#ifdef SERIAL_DEBUG_INTR
483 printk("THRE...");
484#endif
485
486 if (info->xmit_cnt <= 0) {
487 info->IER &= ~UART_IER_THRI;
488 serial_out(info, UART_ESI_CMD1,
489 ESI_SET_SRV_MASK);
490 serial_out(info, UART_ESI_CMD2, info->IER);
491 }
492 }
493
494 release_pio_buffer(pio_buf);
495}
496
497/* Caller must hold info->lock */
498static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes)
499{
500 unsigned long flags;
501
502 dma_bytes = num_bytes;
503
504 if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) {
505 memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
506 dma_bytes);
507 } else {
508 int i = ESP_XMIT_SIZE - info->xmit_tail;
509 memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
510 i);
511 memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i);
512 }
513
514 info->xmit_cnt -= dma_bytes;
515 info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1);
516
517 if (info->xmit_cnt < WAKEUP_CHARS) {
518 rs_sched_event(info, ESP_EVENT_WRITE_WAKEUP);
519
520#ifdef SERIAL_DEBUG_INTR
521 printk("THRE...");
522#endif
523
524 if (info->xmit_cnt <= 0) {
525 info->IER &= ~UART_IER_THRI;
526 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
527 serial_out(info, UART_ESI_CMD2, info->IER);
528 }
529 }
530
531 info->stat_flags |= ESP_STAT_DMA_TX;
532
533 flags=claim_dma_lock();
534 disable_dma(dma);
535 clear_dma_ff(dma);
536 set_dma_mode(dma, DMA_MODE_WRITE);
537 set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
538 set_dma_count(dma, dma_bytes);
539 enable_dma(dma);
540 release_dma_lock(flags);
541
542 serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
543}
544
545static inline void transmit_chars_dma_done(struct esp_struct *info)
546{
547 int num_bytes;
548 unsigned long flags;
549
550
551 flags=claim_dma_lock();
552 disable_dma(dma);
553 clear_dma_ff(dma);
554
555 num_bytes = dma_bytes - get_dma_residue(dma);
556 info->icount.tx += dma_bytes;
557 release_dma_lock(flags);
558
559 if (dma_bytes != num_bytes) {
560 dma_bytes -= num_bytes;
561 memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes);
562
563 flags=claim_dma_lock();
564 disable_dma(dma);
565 clear_dma_ff(dma);
566 set_dma_mode(dma, DMA_MODE_WRITE);
567 set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
568 set_dma_count(dma, dma_bytes);
569 enable_dma(dma);
570 release_dma_lock(flags);
571
572 serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
573 } else {
574 dma_bytes = 0;
575 info->stat_flags &= ~ESP_STAT_DMA_TX;
576 }
577}
578
579static inline void check_modem_status(struct esp_struct *info)
580{
581 int status;
582
583 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
584 status = serial_in(info, UART_ESI_STAT2);
585
586 if (status & UART_MSR_ANY_DELTA) {
587 /* update input line counters */
588 if (status & UART_MSR_TERI)
589 info->icount.rng++;
590 if (status & UART_MSR_DDSR)
591 info->icount.dsr++;
592 if (status & UART_MSR_DDCD)
593 info->icount.dcd++;
594 if (status & UART_MSR_DCTS)
595 info->icount.cts++;
596 wake_up_interruptible(&info->delta_msr_wait);
597 }
598
599 if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
600#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
601 printk("ttys%d CD now %s...", info->line,
602 (status & UART_MSR_DCD) ? "on" : "off");
603#endif
604 if (status & UART_MSR_DCD)
605 wake_up_interruptible(&info->open_wait);
606 else {
607#ifdef SERIAL_DEBUG_OPEN
608 printk("scheduling hangup...");
609#endif
610 schedule_work(&info->tqueue_hangup);
611 }
612 }
613}
614
615/*
616 * This is the serial driver's interrupt routine
617 */
7d12e780 618static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
1da177e4
LT		 619{
620 struct esp_struct * info;
621 unsigned err_status;
622 unsigned int scratch;
623
624#ifdef SERIAL_DEBUG_INTR
625 printk("rs_interrupt_single(%d)...", irq);
626#endif
627 info = (struct esp_struct *)dev_id;
628 err_status = 0;
629 scratch = serial_in(info, UART_ESI_SID);
630
631 spin_lock(&info->lock);
632
633 if (!info->tty) {
634 spin_unlock(&info->lock);
635 return IRQ_NONE;
636 }
637
638 if (scratch & 0x04) { /* error */
639 serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT);
640 err_status = serial_in(info, UART_ESI_STAT1);
641 serial_in(info, UART_ESI_STAT2);
642
643 if (err_status & 0x01)
644 info->stat_flags |= ESP_STAT_RX_TIMEOUT;
645
646 if (err_status & 0x20) /* UART status */
647 check_modem_status(info);
648
649 if (err_status & 0x80) /* Start break */
650 wake_up_interruptible(&info->break_wait);
651 }
652
653 if ((scratch & 0x88) || /* DMA completed or timed out */
654 (err_status & 0x1c) /* receive error */) {
655 if (info->stat_flags & ESP_STAT_DMA_RX)
656 receive_chars_dma_done(info, err_status);
657 else if (info->stat_flags & ESP_STAT_DMA_TX)
658 transmit_chars_dma_done(info);
659 }
660
661 if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
662 ((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) &&
663 (info->IER & UART_IER_RDI)) {
664 int num_bytes;
665
666 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
667 serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
668 num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
669 num_bytes |= serial_in(info, UART_ESI_STAT2);
670
33f0f88f 671 num_bytes = tty_buffer_request_room(info->tty, num_bytes);
1da177e4
LT		 672
673 if (num_bytes) {
674 if (dma_bytes ||
675 (info->stat_flags & ESP_STAT_USE_PIO) ||
676 (num_bytes <= info->config.pio_threshold))
677 receive_chars_pio(info, num_bytes);
678 else
679 receive_chars_dma(info, num_bytes);
680 }
681 }
682
683 if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
684 (scratch & 0x02) && (info->IER & UART_IER_THRI)) {
685 if ((info->xmit_cnt <= 0) || info->tty->stopped) {
686 info->IER &= ~UART_IER_THRI;
687 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
688 serial_out(info, UART_ESI_CMD2, info->IER);
689 } else {
690 int num_bytes;
691
692 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
693 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
694 num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
695 num_bytes |= serial_in(info, UART_ESI_STAT2);
696
697 if (num_bytes > info->xmit_cnt)
698 num_bytes = info->xmit_cnt;
699
700 if (num_bytes) {
701 if (dma_bytes ||
702 (info->stat_flags & ESP_STAT_USE_PIO) ||
703 (num_bytes <= info->config.pio_threshold))
704 transmit_chars_pio(info, num_bytes);
705 else
706 transmit_chars_dma(info, num_bytes);
707 }
708 }
709 }
710
711 info->last_active = jiffies;
712
713#ifdef SERIAL_DEBUG_INTR
714 printk("end.\n");
715#endif
716 spin_unlock(&info->lock);
717 return IRQ_HANDLED;
718}
719
720/*
721 * -------------------------------------------------------------------
722 * Here ends the serial interrupt routines.
723 * -------------------------------------------------------------------
724 */
725
c4028958 726static void do_softint(struct work_struct *work)
1da177e4 727{
c4028958
DH		 728 struct esp_struct *info =
729 container_of(work, struct esp_struct, tqueue);
1da177e4
LT		 730 struct tty_struct *tty;
731
732 tty = info->tty;
733 if (!tty)
734 return;
735
736 if (test_and_clear_bit(ESP_EVENT_WRITE_WAKEUP, &info->event)) {
737 tty_wakeup(tty);
738 }
739}
740
741/*
742 * This routine is called from the scheduler tqueue when the interrupt
743 * routine has signalled that a hangup has occurred. The path of
744 * hangup processing is:
745 *
746 * serial interrupt routine -> (scheduler tqueue) ->
747 * do_serial_hangup() -> tty->hangup() -> esp_hangup()
748 *
749 */
c4028958 750static void do_serial_hangup(struct work_struct *work)
1da177e4 751{
c4028958
DH		 752 struct esp_struct *info =
753 container_of(work, struct esp_struct, tqueue_hangup);
1da177e4
LT		 754 struct tty_struct *tty;
755
756 tty = info->tty;
757 if (tty)
758 tty_hangup(tty);
759}
760
761/*
762 * ---------------------------------------------------------------
763 * Low level utility subroutines for the serial driver: routines to
764 * figure out the appropriate timeout for an interrupt chain, routines
765 * to initialize and startup a serial port, and routines to shutdown a
766 * serial port. Useful stuff like that.
767 *
768 * Caller should hold lock
769 * ---------------------------------------------------------------
770 */
771
772static inline void esp_basic_init(struct esp_struct * info)
773{
774 /* put ESPC in enhanced mode */
775 serial_out(info, UART_ESI_CMD1, ESI_SET_MODE);
776
777 if (info->stat_flags & ESP_STAT_NEVER_DMA)
778 serial_out(info, UART_ESI_CMD2, 0x01);
779 else
780 serial_out(info, UART_ESI_CMD2, 0x31);
781
782 /* disable interrupts for now */
783 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
784 serial_out(info, UART_ESI_CMD2, 0x00);
785
786 /* set interrupt and DMA channel */
787 serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ);
788
789 if (info->stat_flags & ESP_STAT_NEVER_DMA)
790 serial_out(info, UART_ESI_CMD2, 0x01);
791 else
792 serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01);
793
794 serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
795
796 if (info->line % 8) /* secondary port */
797 serial_out(info, UART_ESI_CMD2, 0x0d); /* shared */
798 else if (info->irq == 9)
799 serial_out(info, UART_ESI_CMD2, 0x02);
800 else
801 serial_out(info, UART_ESI_CMD2, info->irq);
802
803 /* set error status mask (check this) */
804 serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK);
805
806 if (info->stat_flags & ESP_STAT_NEVER_DMA)
807 serial_out(info, UART_ESI_CMD2, 0xa1);
808 else
809 serial_out(info, UART_ESI_CMD2, 0xbd);
810
811 serial_out(info, UART_ESI_CMD2, 0x00);
812
813 /* set DMA timeout */
814 serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT);
815 serial_out(info, UART_ESI_CMD2, 0xff);
816
817 /* set FIFO trigger levels */
818 serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
819 serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8);
820 serial_out(info, UART_ESI_CMD2, info->config.rx_trigger);
821 serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8);
822 serial_out(info, UART_ESI_CMD2, info->config.tx_trigger);
823
824 /* Set clock scaling and wait states */
825 serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR);
826 serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE);
827
828 /* set reinterrupt pacing */
829 serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR);
830 serial_out(info, UART_ESI_CMD2, 0xff);
831}
832
833static int startup(struct esp_struct * info)
834{
835 unsigned long flags;
836 int retval=0;
837 unsigned int num_chars;
838
839 spin_lock_irqsave(&info->lock, flags);
840
841 if (info->flags & ASYNC_INITIALIZED)
842 goto out;
843
844 if (!info->xmit_buf) {
845 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC);
846 retval = -ENOMEM;
847 if (!info->xmit_buf)
848 goto out;
849 }
850
851#ifdef SERIAL_DEBUG_OPEN
852 printk("starting up ttys%d (irq %d)...", info->line, info->irq);
853#endif
854
855 /* Flush the RX buffer. Using the ESI flush command may cause */
856 /* wild interrupts, so read all the data instead. */
857
858 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
859 serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
860 num_chars = serial_in(info, UART_ESI_STAT1) << 8;
861 num_chars |= serial_in(info, UART_ESI_STAT2);
862
863 while (num_chars > 1) {
864 inw(info->port + UART_ESI_RX);
865 num_chars -= 2;
866 }
867
868 if (num_chars)
869 serial_in(info, UART_ESI_RX);
870
871 /* set receive character timeout */
872 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
873 serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
874
875 /* clear all flags except the "never DMA" flag */
876 info->stat_flags &= ESP_STAT_NEVER_DMA;
877
878 if (info->stat_flags & ESP_STAT_NEVER_DMA)
879 info->stat_flags |= ESP_STAT_USE_PIO;
880
881 spin_unlock_irqrestore(&info->lock, flags);
882
883 /*
884 * Allocate the IRQ
885 */
886
0f2ed4c6 887 retval = request_irq(info->irq, rs_interrupt_single, IRQF_SHARED,
1da177e4
LT		 888 "esp serial", info);
889
890 if (retval) {
891 if (capable(CAP_SYS_ADMIN)) {
892 if (info->tty)
893 set_bit(TTY_IO_ERROR,
894 &info->tty->flags);
895 retval = 0;
896 }
897 goto out_unlocked;
898 }
899
900 if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) {
901 dma_buffer = (char *)__get_dma_pages(
902 GFP_KERNEL, get_order(DMA_BUFFER_SZ));
903
904 /* use PIO mode if DMA buf/chan cannot be allocated */
905 if (!dma_buffer)
906 info->stat_flags |= ESP_STAT_USE_PIO;
907 else if (request_dma(dma, "esp serial")) {
908 free_pages((unsigned long)dma_buffer,
909 get_order(DMA_BUFFER_SZ));
910 dma_buffer = NULL;
911 info->stat_flags |= ESP_STAT_USE_PIO;
912 }
913
914 }
915
916 info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
917
918 spin_lock_irqsave(&info->lock, flags);
919 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
920 serial_out(info, UART_ESI_CMD2, UART_MCR);
921 serial_out(info, UART_ESI_CMD2, info->MCR);
922
923 /*
924 * Finally, enable interrupts
925 */
926 /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */
927 info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT |
928 UART_IER_DMA_TC;
929 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
930 serial_out(info, UART_ESI_CMD2, info->IER);
931
932 if (info->tty)
933 clear_bit(TTY_IO_ERROR, &info->tty->flags);
934 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
935 spin_unlock_irqrestore(&info->lock, flags);
936
937 /*
938 * Set up the tty->alt_speed kludge
939 */
940 if (info->tty) {
941 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
942 info->tty->alt_speed = 57600;
943 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
944 info->tty->alt_speed = 115200;
945 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
946 info->tty->alt_speed = 230400;
947 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
948 info->tty->alt_speed = 460800;
949 }
950
951 /*
952 * set the speed of the serial port
953 */
954 change_speed(info);
955 info->flags |= ASYNC_INITIALIZED;
956 return 0;
957
958out:
959 spin_unlock_irqrestore(&info->lock, flags);
960out_unlocked:
961 return retval;
962}
963
964/*
965 * This routine will shutdown a serial port; interrupts are disabled, and
966 * DTR is dropped if the hangup on close termio flag is on.
967 */
968static void shutdown(struct esp_struct * info)
969{
970 unsigned long flags, f;
971
972 if (!(info->flags & ASYNC_INITIALIZED))
973 return;
974
975#ifdef SERIAL_DEBUG_OPEN
976 printk("Shutting down serial port %d (irq %d)....", info->line,
977 info->irq);
978#endif
979
980 spin_lock_irqsave(&info->lock, flags);
981 /*
982 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
983 * here so the queue might never be waken up
984 */
985 wake_up_interruptible(&info->delta_msr_wait);
986 wake_up_interruptible(&info->break_wait);
987
988 /* stop a DMA transfer on the port being closed */
989 /* DMA lock is higher priority always */
990 if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) {
991 f=claim_dma_lock();
992 disable_dma(dma);
993 clear_dma_ff(dma);
994 release_dma_lock(f);
995
996 dma_bytes = 0;
997 }
998
999 /*
1000 * Free the IRQ
1001 */
1002 free_irq(info->irq, info);
1003
1004 if (dma_buffer) {
1005 struct esp_struct *current_port = ports;
1006
1007 while (current_port) {
1008 if ((current_port != info) &&
1009 (current_port->flags & ASYNC_INITIALIZED))
1010 break;
1011
1012 current_port = current_port->next_port;
1013 }
1014
1015 if (!current_port) {
1016 free_dma(dma);
1017 free_pages((unsigned long)dma_buffer,
1018 get_order(DMA_BUFFER_SZ));
1019 dma_buffer = NULL;
1020 }
1021 }
1022
1023 if (info->xmit_buf) {
1024 free_page((unsigned long) info->xmit_buf);
1025 info->xmit_buf = NULL;
1026 }
1027
1028 info->IER = 0;
1029 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1030 serial_out(info, UART_ESI_CMD2, 0x00);
1031
1032 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
1033 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1034
1035 info->MCR &= ~UART_MCR_OUT2;
1036 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1037 serial_out(info, UART_ESI_CMD2, UART_MCR);
1038 serial_out(info, UART_ESI_CMD2, info->MCR);
1039
1040 if (info->tty)
1041 set_bit(TTY_IO_ERROR, &info->tty->flags);
1042
1043 info->flags &= ~ASYNC_INITIALIZED;
1044 spin_unlock_irqrestore(&info->lock, flags);
1045}
1046
1047/*
1048 * This routine is called to set the UART divisor registers to match
1049 * the specified baud rate for a serial port.
1050 */
1051static void change_speed(struct esp_struct *info)
1052{
1053 unsigned short port;
1054 int quot = 0;
1055 unsigned cflag,cval;
1056 int baud, bits;
1057 unsigned char flow1 = 0, flow2 = 0;
1058 unsigned long flags;
1059
1060 if (!info->tty || !info->tty->termios)
1061 return;
1062 cflag = info->tty->termios->c_cflag;
1063 port = info->port;
1064
1065 /* byte size and parity */
1066 switch (cflag & CSIZE) {
1067 case CS5: cval = 0x00; bits = 7; break;
1068 case CS6: cval = 0x01; bits = 8; break;
1069 case CS7: cval = 0x02; bits = 9; break;
1070 case CS8: cval = 0x03; bits = 10; break;
1071 default: cval = 0x00; bits = 7; break;
1072 }
1073 if (cflag & CSTOPB) {
1074 cval |= 0x04;
1075 bits++;
1076 }
1077 if (cflag & PARENB) {
1078 cval |= UART_LCR_PARITY;
1079 bits++;
1080 }
1081 if (!(cflag & PARODD))
1082 cval |= UART_LCR_EPAR;
1083#ifdef CMSPAR
1084 if (cflag & CMSPAR)
1085 cval |= UART_LCR_SPAR;
1086#endif
1087
1088 baud = tty_get_baud_rate(info->tty);
1089 if (baud == 38400 &&
1090 ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
1091 quot = info->custom_divisor;
1092 else {
1093 if (baud == 134)
1094 /* Special case since 134 is really 134.5 */
1095 quot = (2*BASE_BAUD / 269);
1096 else if (baud)
1097 quot = BASE_BAUD / baud;
1098 }
1099 /* If the quotient is ever zero, default to 9600 bps */
1100 if (!quot)
1101 quot = BASE_BAUD / 9600;
1102
1103 info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50);
1104
1105 /* CTS flow control flag and modem status interrupts */
1106 /* info->IER &= ~UART_IER_MSI; */
1107 if (cflag & CRTSCTS) {
1108 info->flags |= ASYNC_CTS_FLOW;
1109 /* info->IER |= UART_IER_MSI; */
1110 flow1 = 0x04;
1111 flow2 = 0x10;
1112 } else
1113 info->flags &= ~ASYNC_CTS_FLOW;
1114 if (cflag & CLOCAL)
1115 info->flags &= ~ASYNC_CHECK_CD;
1116 else {
1117 info->flags |= ASYNC_CHECK_CD;
1118 /* info->IER |= UART_IER_MSI; */
1119 }
1120
1121 /*
1122 * Set up parity check flag
1123 */
1124#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
1125
1126 info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
1127 if (I_INPCK(info->tty))
1128 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
1129 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
1130 info->read_status_mask |= UART_LSR_BI;
1131
1132 info->ignore_status_mask = 0;
1133#if 0
1134 /* This should be safe, but for some broken bits of hardware... */
1135 if (I_IGNPAR(info->tty)) {
1136 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
1137 info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
1138 }
1139#endif
1140 if (I_IGNBRK(info->tty)) {
1141 info->ignore_status_mask |= UART_LSR_BI;
1142 info->read_status_mask |= UART_LSR_BI;
1143 /*
1144 * If we're ignore parity and break indicators, ignore
1145 * overruns too. (For real raw support).
1146 */
1147 if (I_IGNPAR(info->tty)) {
1148 info->ignore_status_mask |= UART_LSR_OE | \
1149 UART_LSR_PE | UART_LSR_FE;
1150 info->read_status_mask |= UART_LSR_OE | \
1151 UART_LSR_PE | UART_LSR_FE;
1152 }
1153 }
1154
1155 if (I_IXOFF(info->tty))
1156 flow1 |= 0x81;
1157
1158 spin_lock_irqsave(&info->lock, flags);
1159 /* set baud */
1160 serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD);
1161 serial_out(info, UART_ESI_CMD2, quot >> 8);
1162 serial_out(info, UART_ESI_CMD2, quot & 0xff);
1163
1164 /* set data bits, parity, etc. */
1165 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1166 serial_out(info, UART_ESI_CMD2, UART_LCR);
1167 serial_out(info, UART_ESI_CMD2, cval);
1168
1169 /* Enable flow control */
1170 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL);
1171 serial_out(info, UART_ESI_CMD2, flow1);
1172 serial_out(info, UART_ESI_CMD2, flow2);
1173
1174 /* set flow control characters (XON/XOFF only) */
1175 if (I_IXOFF(info->tty)) {
1176 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS);
1177 serial_out(info, UART_ESI_CMD2, START_CHAR(info->tty));
1178 serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->tty));
1179 serial_out(info, UART_ESI_CMD2, 0x10);
1180 serial_out(info, UART_ESI_CMD2, 0x21);
1181 switch (cflag & CSIZE) {
1182 case CS5:
1183 serial_out(info, UART_ESI_CMD2, 0x1f);
1184 break;
1185 case CS6:
1186 serial_out(info, UART_ESI_CMD2, 0x3f);
1187 break;
1188 case CS7:
1189 case CS8:
1190 serial_out(info, UART_ESI_CMD2, 0x7f);
1191 break;
1192 default:
1193 serial_out(info, UART_ESI_CMD2, 0xff);
1194 break;
1195 }
1196 }
1197
1198 /* Set high/low water */
1199 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1200 serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8);
1201 serial_out(info, UART_ESI_CMD2, info->config.flow_off);
1202 serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8);
1203 serial_out(info, UART_ESI_CMD2, info->config.flow_on);
1204
1205 spin_unlock_irqrestore(&info->lock, flags);
1206}
1207
1208static void rs_put_char(struct tty_struct *tty, unsigned char ch)
1209{
1210 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1211 unsigned long flags;
1212
1213 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
1214 return;
1215
a2f20c7c 1216 if (!info->xmit_buf)
1da177e4
LT		 1217 return;
1218
1219 spin_lock_irqsave(&info->lock, flags);
1220 if (info->xmit_cnt < ESP_XMIT_SIZE - 1) {
1221 info->xmit_buf[info->xmit_head++] = ch;
1222 info->xmit_head &= ESP_XMIT_SIZE-1;
1223 info->xmit_cnt++;
1224 }
1225 spin_unlock_irqrestore(&info->lock, flags);
1226}
1227
1228static void rs_flush_chars(struct tty_struct *tty)
1229{
1230 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1231 unsigned long flags;
1232
1233 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
1234 return;
1235
1236 spin_lock_irqsave(&info->lock, flags);
1237
1238 if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf)
1239 goto out;
1240
1241 if (!(info->IER & UART_IER_THRI)) {
1242 info->IER |= UART_IER_THRI;
1243 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1244 serial_out(info, UART_ESI_CMD2, info->IER);
1245 }
1246out:
1247 spin_unlock_irqrestore(&info->lock, flags);
1248}
1249
1250static int rs_write(struct tty_struct * tty,
1251 const unsigned char *buf, int count)
1252{
1253 int c, t, ret = 0;
1254 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1255 unsigned long flags;
1256
1257 if (serial_paranoia_check(info, tty->name, "rs_write"))
1258 return 0;
1259
a2f20c7c 1260 if (!info->xmit_buf)
1da177e4
LT		 1261 return 0;
1262
1263 while (1) {
1264 /* Thanks to R. Wolff for suggesting how to do this with */
1265 /* interrupts enabled */
1266
1267 c = count;
1268 t = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1269
1270 if (t < c)
1271 c = t;
1272
1273 t = ESP_XMIT_SIZE - info->xmit_head;
1274
1275 if (t < c)
1276 c = t;
1277
1278 if (c <= 0)
1279 break;
1280
1281 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1282
1283 info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1);
1284 info->xmit_cnt += c;
1285 buf += c;
1286 count -= c;
1287 ret += c;
1288 }
1289
1290 spin_lock_irqsave(&info->lock, flags);
1291
1292 if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
1293 info->IER |= UART_IER_THRI;
1294 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1295 serial_out(info, UART_ESI_CMD2, info->IER);
1296 }
1297
1298 spin_unlock_irqrestore(&info->lock, flags);
1299 return ret;
1300}
1301
1302static int rs_write_room(struct tty_struct *tty)
1303{
1304 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1305 int ret;
1306 unsigned long flags;
1307
1308 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
1309 return 0;
1310
1311 spin_lock_irqsave(&info->lock, flags);
1312
1313 ret = ESP_XMIT_SIZE - info->xmit_cnt - 1;
1314 if (ret < 0)
1315 ret = 0;
1316 spin_unlock_irqrestore(&info->lock, flags);
1317 return ret;
1318}
1319
1320static int rs_chars_in_buffer(struct tty_struct *tty)
1321{
1322 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1323
1324 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
1325 return 0;
1326 return info->xmit_cnt;
1327}
1328
1329static void rs_flush_buffer(struct tty_struct *tty)
1330{
1331 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1332 unsigned long flags;
1333
1334 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
1335 return;
1336 spin_lock_irqsave(&info->lock, flags);
1337 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1338 spin_unlock_irqrestore(&info->lock, flags);
1339 tty_wakeup(tty);
1340}
1341
1342/*
1343 * ------------------------------------------------------------
1344 * rs_throttle()
1345 *
1346 * This routine is called by the upper-layer tty layer to signal that
1347 * incoming characters should be throttled.
1348 * ------------------------------------------------------------
1349 */
1350static void rs_throttle(struct tty_struct * tty)
1351{
1352 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1353 unsigned long flags;
1354#ifdef SERIAL_DEBUG_THROTTLE
1355 char buf[64];
1356
1357 printk("throttle %s: %d....\n", tty_name(tty, buf),
1358 tty->ldisc.chars_in_buffer(tty));
1359#endif
1360
1361 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1362 return;
1363
1364 spin_lock_irqsave(&info->lock, flags);
1365 info->IER &= ~UART_IER_RDI;
1366 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1367 serial_out(info, UART_ESI_CMD2, info->IER);
1368 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1369 serial_out(info, UART_ESI_CMD2, 0x00);
1370 spin_unlock_irqrestore(&info->lock, flags);
1371}
1372
1373static void rs_unthrottle(struct tty_struct * tty)
1374{
1375 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1376 unsigned long flags;
1377#ifdef SERIAL_DEBUG_THROTTLE
1378 char buf[64];
1379
1380 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1381 tty->ldisc.chars_in_buffer(tty));
1382#endif
1383
1384 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1385 return;
1386
1387 spin_lock_irqsave(&info->lock, flags);
1388 info->IER |= UART_IER_RDI;
1389 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
1390 serial_out(info, UART_ESI_CMD2, info->IER);
1391 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
1392 serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
1393 spin_unlock_irqrestore(&info->lock, flags);
1394}
1395
1396/*
1397 * ------------------------------------------------------------
1398 * rs_ioctl() and friends
1399 * ------------------------------------------------------------
1400 */
1401
1402static int get_serial_info(struct esp_struct * info,
1403 struct serial_struct __user *retinfo)
1404{
1405 struct serial_struct tmp;
1406
1407 memset(&tmp, 0, sizeof(tmp));
1408 tmp.type = PORT_16550A;
1409 tmp.line = info->line;
1410 tmp.port = info->port;
1411 tmp.irq = info->irq;
1412 tmp.flags = info->flags;
1413 tmp.xmit_fifo_size = 1024;
1414 tmp.baud_base = BASE_BAUD;
1415 tmp.close_delay = info->close_delay;
1416 tmp.closing_wait = info->closing_wait;
1417 tmp.custom_divisor = info->custom_divisor;
1418 tmp.hub6 = 0;
1419 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1420 return -EFAULT;
1421 return 0;
1422}
1423
1424static int get_esp_config(struct esp_struct * info,
1425 struct hayes_esp_config __user *retinfo)
1426{
1427 struct hayes_esp_config tmp;
1428
1429 if (!retinfo)
1430 return -EFAULT;
1431
1432 memset(&tmp, 0, sizeof(tmp));
1433 tmp.rx_timeout = info->config.rx_timeout;
1434 tmp.rx_trigger = info->config.rx_trigger;
1435 tmp.tx_trigger = info->config.tx_trigger;
1436 tmp.flow_off = info->config.flow_off;
1437 tmp.flow_on = info->config.flow_on;
1438 tmp.pio_threshold = info->config.pio_threshold;
1439 tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma);
1440
1441 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
1442}
1443
1444static int set_serial_info(struct esp_struct * info,
1445 struct serial_struct __user *new_info)
1446{
1447 struct serial_struct new_serial;
1448 struct esp_struct old_info;
1449 unsigned int change_irq;
1450 int retval = 0;
1451 struct esp_struct *current_async;
1452
1453 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1454 return -EFAULT;
1455 old_info = *info;
1456
1457 if ((new_serial.type != PORT_16550A) ||
1458 (new_serial.hub6) ||
1459 (info->port != new_serial.port) ||
1460 (new_serial.baud_base != BASE_BAUD) ||
1461 (new_serial.irq > 15) ||
1462 (new_serial.irq < 2) ||
1463 (new_serial.irq == 6) ||
1464 (new_serial.irq == 8) ||
1465 (new_serial.irq == 13))
1466 return -EINVAL;
1467
1468 change_irq = new_serial.irq != info->irq;
1469
1470 if (change_irq && (info->line % 8))
1471 return -EINVAL;
1472
1473 if (!capable(CAP_SYS_ADMIN)) {
1474 if (change_irq ||
1475 (new_serial.close_delay != info->close_delay) ||
1476 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1477 (info->flags & ~ASYNC_USR_MASK)))
1478 return -EPERM;
1479 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1480 (new_serial.flags & ASYNC_USR_MASK));
1481 info->custom_divisor = new_serial.custom_divisor;
1482 } else {
1483 if (new_serial.irq == 2)
1484 new_serial.irq = 9;
1485
1486 if (change_irq) {
1487 current_async = ports;
1488
1489 while (current_async) {
1490 if ((current_async->line >= info->line) &&
1491 (current_async->line < (info->line + 8))) {
1492 if (current_async == info) {
1493 if (current_async->count > 1)
1494 return -EBUSY;
1495 } else if (current_async->count)
1496 return -EBUSY;
1497 }
1498
1499 current_async = current_async->next_port;
1500 }
1501 }
1502
1503 /*
1504 * OK, past this point, all the error checking has been done.
1505 * At this point, we start making changes.....
1506 */
1507
1508 info->flags = ((info->flags & ~ASYNC_FLAGS) |
1509 (new_serial.flags & ASYNC_FLAGS));
1510 info->custom_divisor = new_serial.custom_divisor;
1511 info->close_delay = new_serial.close_delay * HZ/100;
1512 info->closing_wait = new_serial.closing_wait * HZ/100;
1513
1514 if (change_irq) {
1515 /*
1516 * We need to shutdown the serial port at the old
1517 * port/irq combination.
1518 */
1519 shutdown(info);
1520
1521 current_async = ports;
1522
1523 while (current_async) {
1524 if ((current_async->line >= info->line) &&
1525 (current_async->line < (info->line + 8)))
1526 current_async->irq = new_serial.irq;
1527
1528 current_async = current_async->next_port;
1529 }
1530
1531 serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
1532 if (info->irq == 9)
1533 serial_out(info, UART_ESI_CMD2, 0x02);
1534 else
1535 serial_out(info, UART_ESI_CMD2, info->irq);
1536 }
1537 }
1538
1539 if (info->flags & ASYNC_INITIALIZED) {
1540 if (((old_info.flags & ASYNC_SPD_MASK) !=
1541 (info->flags & ASYNC_SPD_MASK)) ||
1542 (old_info.custom_divisor != info->custom_divisor)) {
1543 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1544 info->tty->alt_speed = 57600;
1545 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1546 info->tty->alt_speed = 115200;
1547 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1548 info->tty->alt_speed = 230400;
1549 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1550 info->tty->alt_speed = 460800;
1551 change_speed(info);
1552 }
1553 } else
1554 retval = startup(info);
1555
1556 return retval;
1557}
1558
1559static int set_esp_config(struct esp_struct * info,
1560 struct hayes_esp_config __user * new_info)
1561{
1562 struct hayes_esp_config new_config;
1563 unsigned int change_dma;
1564 int retval = 0;
1565 struct esp_struct *current_async;
1566 unsigned long flags;
1567
1568 /* Perhaps a non-sysadmin user should be able to do some of these */
1569 /* operations. I haven't decided yet. */
1570
1571 if (!capable(CAP_SYS_ADMIN))
1572 return -EPERM;
1573
1574 if (copy_from_user(&new_config, new_info, sizeof(new_config)))
1575 return -EFAULT;
1576
1577 if ((new_config.flow_on >= new_config.flow_off) ||
1578 (new_config.rx_trigger < 1) ||
1579 (new_config.tx_trigger < 1) ||
1580 (new_config.flow_off < 1) ||
1581 (new_config.flow_on < 1) ||
1582 (new_config.rx_trigger > 1023) ||
1583 (new_config.tx_trigger > 1023) ||
1584 (new_config.flow_off > 1023) ||
1585 (new_config.flow_on > 1023) ||
1586 (new_config.pio_threshold < 0) ||
1587 (new_config.pio_threshold > 1024))
1588 return -EINVAL;
1589
1590 if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3))
1591 new_config.dma_channel = 0;
1592
1593 if (info->stat_flags & ESP_STAT_NEVER_DMA)
1594 change_dma = new_config.dma_channel;
1595 else
1596 change_dma = (new_config.dma_channel != dma);
1597
1598 if (change_dma) {
1599 if (new_config.dma_channel) {
1600 /* PIO mode to DMA mode transition OR */
1601 /* change current DMA channel */
1602
1603 current_async = ports;
1604
1605 while (current_async) {
1606 if (current_async == info) {
1607 if (current_async->count > 1)
1608 return -EBUSY;
1609 } else if (current_async->count)
1610 return -EBUSY;
1611
1612 current_async =
1613 current_async->next_port;
1614 }
1615
1616 shutdown(info);
1617 dma = new_config.dma_channel;
1618 info->stat_flags &= ~ESP_STAT_NEVER_DMA;
1619
1620 /* all ports must use the same DMA channel */
1621
1622 spin_lock_irqsave(&info->lock, flags);
1623 current_async = ports;
1624
1625 while (current_async) {
1626 esp_basic_init(current_async);
1627 current_async = current_async->next_port;
1628 }
1629 spin_unlock_irqrestore(&info->lock, flags);
1630 } else {
1631 /* DMA mode to PIO mode only */
1632
1633 if (info->count > 1)
1634 return -EBUSY;
1635
1636 shutdown(info);
1637 spin_lock_irqsave(&info->lock, flags);
1638 info->stat_flags |= ESP_STAT_NEVER_DMA;
1639 esp_basic_init(info);
1640 spin_unlock_irqrestore(&info->lock, flags);
1641 }
1642 }
1643
1644 info->config.pio_threshold = new_config.pio_threshold;
1645
1646 if ((new_config.flow_off != info->config.flow_off) ||
1647 (new_config.flow_on != info->config.flow_on)) {
1648 unsigned long flags;
1649
1650 info->config.flow_off = new_config.flow_off;
1651 info->config.flow_on = new_config.flow_on;
1652
1653 spin_lock_irqsave(&info->lock, flags);
1654 serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
1655 serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
1656 serial_out(info, UART_ESI_CMD2, new_config.flow_off);
1657 serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
1658 serial_out(info, UART_ESI_CMD2, new_config.flow_on);
1659 spin_unlock_irqrestore(&info->lock, flags);
1660 }
1661
1662 if ((new_config.rx_trigger != info->config.rx_trigger) ||
1663 (new_config.tx_trigger != info->config.tx_trigger)) {
1664 unsigned long flags;
1665
1666 info->config.rx_trigger = new_config.rx_trigger;
1667 info->config.tx_trigger = new_config.tx_trigger;
1668 spin_lock_irqsave(&info->lock, flags);
1669 serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
1670 serial_out(info, UART_ESI_CMD2,
1671 new_config.rx_trigger >> 8);
1672 serial_out(info, UART_ESI_CMD2, new_config.rx_trigger);
1673 serial_out(info, UART_ESI_CMD2,
1674 new_config.tx_trigger >> 8);
1675 serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
1676 spin_unlock_irqrestore(&info->lock, flags);
1677 }
1678
1679 if (new_config.rx_timeout != info->config.rx_timeout) {
1680 unsigned long flags;
1681
1682 info->config.rx_timeout = new_config.rx_timeout;
1683 spin_lock_irqsave(&info->lock, flags);
1684
1685 if (info->IER & UART_IER_RDI) {
1686 serial_out(info, UART_ESI_CMD1,
1687 ESI_SET_RX_TIMEOUT);
1688 serial_out(info, UART_ESI_CMD2,
1689 new_config.rx_timeout);
1690 }
1691
1692 spin_unlock_irqrestore(&info->lock, flags);
1693 }
1694
1695 if (!(info->flags & ASYNC_INITIALIZED))
1696 retval = startup(info);
1697
1698 return retval;
1699}
1700
1701/*
1702 * get_lsr_info - get line status register info
1703 *
1704 * Purpose: Let user call ioctl() to get info when the UART physically
1705 * is emptied. On bus types like RS485, the transmitter must
1706 * release the bus after transmitting. This must be done when
1707 * the transmit shift register is empty, not be done when the
1708 * transmit holding register is empty. This functionality
1709 * allows an RS485 driver to be written in user space.
1710 */
1711static int get_lsr_info(struct esp_struct * info, unsigned int __user *value)
1712{
1713 unsigned char status;
1714 unsigned int result;
1715 unsigned long flags;
1716
1717 spin_lock_irqsave(&info->lock, flags);
1718 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1719 status = serial_in(info, UART_ESI_STAT1);
1720 spin_unlock_irqrestore(&info->lock, flags);
1721 result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1722 return put_user(result,value);
1723}
1724
1725
1726static int esp_tiocmget(struct tty_struct *tty, struct file *file)
1727{
1728 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1729 unsigned char control, status;
1730 unsigned long flags;
1731
1732 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1733 return -ENODEV;
1734 if (tty->flags & (1 << TTY_IO_ERROR))
1735 return -EIO;
1736
1737 control = info->MCR;
1738
1739 spin_lock_irqsave(&info->lock, flags);
1740 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
1741 status = serial_in(info, UART_ESI_STAT2);
1742 spin_unlock_irqrestore(&info->lock, flags);
1743
1744 return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
1745 | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
1746 | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
1747 | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
1748 | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
1749 | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1750}
1751
1752static int esp_tiocmset(struct tty_struct *tty, struct file *file,
1753 unsigned int set, unsigned int clear)
1754{
1755 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1756 unsigned long flags;
1757
1758 if (serial_paranoia_check(info, tty->name, __FUNCTION__))
1759 return -ENODEV;
1760 if (tty->flags & (1 << TTY_IO_ERROR))
1761 return -EIO;
1762
1763 spin_lock_irqsave(&info->lock, flags);
1764
1765 if (set & TIOCM_RTS)
1766 info->MCR |= UART_MCR_RTS;
1767 if (set & TIOCM_DTR)
1768 info->MCR |= UART_MCR_DTR;
1769
1770 if (clear & TIOCM_RTS)
1771 info->MCR &= ~UART_MCR_RTS;
1772 if (clear & TIOCM_DTR)
1773 info->MCR &= ~UART_MCR_DTR;
1774
1775 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1776 serial_out(info, UART_ESI_CMD2, UART_MCR);
1777 serial_out(info, UART_ESI_CMD2, info->MCR);
1778
1779 spin_unlock_irqrestore(&info->lock, flags);
1780 return 0;
1781}
1782
1783/*
1784 * rs_break() --- routine which turns the break handling on or off
1785 */
1786static void esp_break(struct tty_struct *tty, int break_state)
1787{
1788 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1789 unsigned long flags;
1790
1791 if (serial_paranoia_check(info, tty->name, "esp_break"))
1792 return;
1793
1794 if (break_state == -1) {
1795 spin_lock_irqsave(&info->lock, flags);
1796 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1797 serial_out(info, UART_ESI_CMD2, 0x01);
1798 spin_unlock_irqrestore(&info->lock, flags);
1799
1800 /* FIXME - new style wait needed here */
1801 interruptible_sleep_on(&info->break_wait);
1802 } else {
1803 spin_lock_irqsave(&info->lock, flags);
1804 serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
1805 serial_out(info, UART_ESI_CMD2, 0x00);
1806 spin_unlock_irqrestore(&info->lock, flags);
1807 }
1808}
1809
1810static int rs_ioctl(struct tty_struct *tty, struct file * file,
1811 unsigned int cmd, unsigned long arg)
1812{
1813 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1814 struct async_icount cprev, cnow; /* kernel counter temps */
1815 struct serial_icounter_struct __user *p_cuser; /* user space */
1816 void __user *argp = (void __user *)arg;
1817 unsigned long flags;
1818
1819 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1820 return -ENODEV;
1821
1822 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1823 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
1824 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
1825 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
1826 (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
1827 if (tty->flags & (1 << TTY_IO_ERROR))
1828 return -EIO;
1829 }
1830
1831 switch (cmd) {
1832 case TIOCGSERIAL:
1833 return get_serial_info(info, argp);
1834 case TIOCSSERIAL:
1835 return set_serial_info(info, argp);
1836 case TIOCSERCONFIG:
1837 /* do not reconfigure after initial configuration */
1838 return 0;
1839
1840 case TIOCSERGWILD:
1841 return put_user(0L, (unsigned long __user *)argp);
1842
1843 case TIOCSERGETLSR: /* Get line status register */
1844 return get_lsr_info(info, argp);
1845
1846 case TIOCSERSWILD:
1847 if (!capable(CAP_SYS_ADMIN))
1848 return -EPERM;
1849 return 0;
1850
1851 /*
1852 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1853 * - mask passed in arg for lines of interest
1854 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1855 * Caller should use TIOCGICOUNT to see which one it was
1856 */
1857 case TIOCMIWAIT:
1858 spin_lock_irqsave(&info->lock, flags);
1859 cprev = info->icount; /* note the counters on entry */
1860 spin_unlock_irqrestore(&info->lock, flags);
1861 while (1) {
1862 /* FIXME: convert to new style wakeup */
1863 interruptible_sleep_on(&info->delta_msr_wait);
1864 /* see if a signal did it */
1865 if (signal_pending(current))
1866 return -ERESTARTSYS;
1867 spin_lock_irqsave(&info->lock, flags);
1868 cnow = info->icount; /* atomic copy */
1869 spin_unlock_irqrestore(&info->lock, flags);
1870 if (cnow.rng == cprev.rng &&
1871 cnow.dsr == cprev.dsr &&
1872 cnow.dcd == cprev.dcd &&
1873 cnow.cts == cprev.cts)
1874 return -EIO; /* no change => error */
1875 if (((arg & TIOCM_RNG) &&
1876 (cnow.rng != cprev.rng)) ||
1877 ((arg & TIOCM_DSR) &&
1878 (cnow.dsr != cprev.dsr)) ||
1879 ((arg & TIOCM_CD) &&
1880 (cnow.dcd != cprev.dcd)) ||
1881 ((arg & TIOCM_CTS) &&
1882 (cnow.cts != cprev.cts)) ) {
1883 return 0;
1884 }
1885 cprev = cnow;
1886 }
1887 /* NOTREACHED */
1888
1889 /*
1890 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1891 * Return: write counters to the user passed counter struct
1892 * NB: both 1->0 and 0->1 transitions are counted except for
1893 * RI where only 0->1 is counted.
1894 */
1895 case TIOCGICOUNT:
1896 spin_lock_irqsave(&info->lock, flags);
1897 cnow = info->icount;
1898 spin_unlock_irqrestore(&info->lock, flags);
1899 p_cuser = argp;
1900 if (put_user(cnow.cts, &p_cuser->cts) ||
1901 put_user(cnow.dsr, &p_cuser->dsr) ||
1902 put_user(cnow.rng, &p_cuser->rng) ||
1903 put_user(cnow.dcd, &p_cuser->dcd))
1904 return -EFAULT;
1905
1906 return 0;
1907 case TIOCGHAYESESP:
1908 return get_esp_config(info, argp);
1909 case TIOCSHAYESESP:
1910 return set_esp_config(info, argp);
1911
1912 default:
1913 return -ENOIOCTLCMD;
1914 }
1915 return 0;
1916}
1917
1918static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1919{
1920 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
1921 unsigned long flags;
1922
1923 if ( (tty->termios->c_cflag == old_termios->c_cflag)
1924 && ( RELEVANT_IFLAG(tty->termios->c_iflag)
1925 == RELEVANT_IFLAG(old_termios->c_iflag)))
1926 return;
1927
1928 change_speed(info);
1929
1930 spin_lock_irqsave(&info->lock, flags);
1931
1932 /* Handle transition to B0 status */
1933 if ((old_termios->c_cflag & CBAUD) &&
1934 !(tty->termios->c_cflag & CBAUD)) {
1935 info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
1936 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1937 serial_out(info, UART_ESI_CMD2, UART_MCR);
1938 serial_out(info, UART_ESI_CMD2, info->MCR);
1939 }
1940
1941 /* Handle transition away from B0 status */
1942 if (!(old_termios->c_cflag & CBAUD) &&
1943 (tty->termios->c_cflag & CBAUD)) {
1944 info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
1945 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
1946 serial_out(info, UART_ESI_CMD2, UART_MCR);
1947 serial_out(info, UART_ESI_CMD2, info->MCR);
1948 }
1949
1950 spin_unlock_irqrestore(&info->lock, flags);
1951
1952 /* Handle turning of CRTSCTS */
1953 if ((old_termios->c_cflag & CRTSCTS) &&
1954 !(tty->termios->c_cflag & CRTSCTS)) {
1955 rs_start(tty);
1956 }
1957}
1958
1959/*
1960 * ------------------------------------------------------------
1961 * rs_close()
1962 *
1963 * This routine is called when the serial port gets closed. First, we
1964 * wait for the last remaining data to be sent. Then, we unlink its
1965 * async structure from the interrupt chain if necessary, and we free
1966 * that IRQ if nothing is left in the chain.
1967 * ------------------------------------------------------------
1968 */
1969static void rs_close(struct tty_struct *tty, struct file * filp)
1970{
1971 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
1972 unsigned long flags;
1973
1974 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1975 return;
1976
1977 spin_lock_irqsave(&info->lock, flags);
1978
1979 if (tty_hung_up_p(filp)) {
1980 DBG_CNT("before DEC-hung");
1981 goto out;
1982 }
1983
1984#ifdef SERIAL_DEBUG_OPEN
1985 printk("rs_close ttys%d, count = %d\n", info->line, info->count);
1986#endif
1987 if ((tty->count == 1) && (info->count != 1)) {
1988 /*
1989 * Uh, oh. tty->count is 1, which means that the tty
1990 * structure will be freed. Info->count should always
1991 * be one in these conditions. If it's greater than
1992 * one, we've got real problems, since it means the
1993 * serial port won't be shutdown.
1994 */
1995 printk("rs_close: bad serial port count; tty->count is 1, "
1996 "info->count is %d\n", info->count);
1997 info->count = 1;
1998 }
1999 if (--info->count < 0) {
2000 printk("rs_close: bad serial port count for ttys%d: %d\n",
2001 info->line, info->count);
2002 info->count = 0;
2003 }
2004 if (info->count) {
2005 DBG_CNT("before DEC-2");
2006 goto out;
2007 }
2008 info->flags |= ASYNC_CLOSING;
2009
2010 spin_unlock_irqrestore(&info->lock, flags);
2011 /*
2012 * Now we wait for the transmit buffer to clear; and we notify
2013 * the line discipline to only process XON/XOFF characters.
2014 */
2015 tty->closing = 1;
2016 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
2017 tty_wait_until_sent(tty, info->closing_wait);
2018 /*
2019 * At this point we stop accepting input. To do this, we
2020 * disable the receive line status interrupts, and tell the
2021 * interrupt driver to stop checking the data ready bit in the
2022 * line status register.
2023 */
2024 /* info->IER &= ~UART_IER_RLSI; */
2025 info->IER &= ~UART_IER_RDI;
2026 info->read_status_mask &= ~UART_LSR_DR;
2027 if (info->flags & ASYNC_INITIALIZED) {
2028
2029 spin_lock_irqsave(&info->lock, flags);
2030 serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
2031 serial_out(info, UART_ESI_CMD2, info->IER);
2032
2033 /* disable receive timeout */
2034 serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
2035 serial_out(info, UART_ESI_CMD2, 0x00);
2036
2037 spin_unlock_irqrestore(&info->lock, flags);
2038
2039 /*
2040 * Before we drop DTR, make sure the UART transmitter
2041 * has completely drained; this is especially
2042 * important if there is a transmit FIFO!
2043 */
2044 rs_wait_until_sent(tty, info->timeout);
2045 }
2046 shutdown(info);
2047 if (tty->driver->flush_buffer)
2048 tty->driver->flush_buffer(tty);
2049 tty_ldisc_flush(tty);
2050 tty->closing = 0;
2051 info->event = 0;
2052 info->tty = NULL;
2053
2054 if (info->blocked_open) {
2055 if (info->close_delay) {
2056 msleep_interruptible(jiffies_to_msecs(info->close_delay));
2057 }
2058 wake_up_interruptible(&info->open_wait);
2059 }
2060 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
2061 wake_up_interruptible(&info->close_wait);
2062 return;
2063
2064out:
2065 spin_unlock_irqrestore(&info->lock, flags);
2066}
2067
2068static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
2069{
2070 struct esp_struct *info = (struct esp_struct *)tty->driver_data;
2071 unsigned long orig_jiffies, char_time;
2072 unsigned long flags;
2073
2074 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
2075 return;
2076
2077 orig_jiffies = jiffies;
2078 char_time = ((info->timeout - HZ / 50) / 1024) / 5;
2079
2080 if (!char_time)
2081 char_time = 1;
2082
2083 spin_lock_irqsave(&info->lock, flags);
2084 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2085 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2086
2087 while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
2088 (serial_in(info, UART_ESI_STAT2) != 0xff)) {
2089
2090 spin_unlock_irqrestore(&info->lock, flags);
2091 msleep_interruptible(jiffies_to_msecs(char_time));
2092
2093 if (signal_pending(current))
2094 break;
2095
2096 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2097 break;
2098
2099 spin_lock_irqsave(&info->lock, flags);
2100 serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
2101 serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
2102 }
2103 spin_unlock_irqrestore(&info->lock, flags);
2104 set_current_state(TASK_RUNNING);
2105}
2106
2107/*
2108 * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
2109 */
2110static void esp_hangup(struct tty_struct *tty)
2111{
2112 struct esp_struct * info = (struct esp_struct *)tty->driver_data;
2113
2114 if (serial_paranoia_check(info, tty->name, "esp_hangup"))
2115 return;
2116
2117 rs_flush_buffer(tty);
2118 shutdown(info);
2119 info->event = 0;
2120 info->count = 0;
2121 info->flags &= ~ASYNC_NORMAL_ACTIVE;
2122 info->tty = NULL;
2123 wake_up_interruptible(&info->open_wait);
2124}
2125
2126/*
2127 * ------------------------------------------------------------
2128 * esp_open() and friends
2129 * ------------------------------------------------------------
2130 */
2131static int block_til_ready(struct tty_struct *tty, struct file * filp,
2132 struct esp_struct *info)
2133{
2134 DECLARE_WAITQUEUE(wait, current);
2135 int retval;
2136 int do_clocal = 0;
2137 unsigned long flags;
2138
2139 /*
2140 * If the device is in the middle of being closed, then block
2141 * until it's done, and then try again.
2142 */
2143 if (tty_hung_up_p(filp) ||
2144 (info->flags & ASYNC_CLOSING)) {
2145 if (info->flags & ASYNC_CLOSING)
2146 interruptible_sleep_on(&info->close_wait);
2147#ifdef SERIAL_DO_RESTART
2148 if (info->flags & ASYNC_HUP_NOTIFY)
2149 return -EAGAIN;
2150 else
2151 return -ERESTARTSYS;
2152#else
2153 return -EAGAIN;
2154#endif
2155 }
2156
2157 /*
2158 * If non-blocking mode is set, or the port is not enabled,
2159 * then make the check up front and then exit.
2160 */
2161 if ((filp->f_flags & O_NONBLOCK) ||
2162 (tty->flags & (1 << TTY_IO_ERROR))) {
2163 info->flags |= ASYNC_NORMAL_ACTIVE;
2164 return 0;
2165 }
2166
2167 if (tty->termios->c_cflag & CLOCAL)
2168 do_clocal = 1;
2169
2170 /*
2171 * Block waiting for the carrier detect and the line to become
2172 * free (i.e., not in use by the callout). While we are in
2173 * this loop, info->count is dropped by one, so that
2174 * rs_close() knows when to free things. We restore it upon
2175 * exit, either normal or abnormal.
2176 */
2177 retval = 0;
2178 add_wait_queue(&info->open_wait, &wait);
2179#ifdef SERIAL_DEBUG_OPEN
2180 printk("block_til_ready before block: ttys%d, count = %d\n",
2181 info->line, info->count);
2182#endif
2183 spin_lock_irqsave(&info->lock, flags);
2184 if (!tty_hung_up_p(filp))
2185 info->count--;
2186 info->blocked_open++;
2187 while (1) {
2188 if ((tty->termios->c_cflag & CBAUD)) {
2189 unsigned int scratch;
2190
2191 serial_out(info, UART_ESI_CMD1, ESI_READ_UART);
2192 serial_out(info, UART_ESI_CMD2, UART_MCR);
2193 scratch = serial_in(info, UART_ESI_STAT1);
2194 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2195 serial_out(info, UART_ESI_CMD2, UART_MCR);
2196 serial_out(info, UART_ESI_CMD2,
2197 scratch | UART_MCR_DTR | UART_MCR_RTS);
2198 }
2199 set_current_state(TASK_INTERRUPTIBLE);
2200 if (tty_hung_up_p(filp) ||
2201 !(info->flags & ASYNC_INITIALIZED)) {
2202#ifdef SERIAL_DO_RESTART
2203 if (info->flags & ASYNC_HUP_NOTIFY)
2204 retval = -EAGAIN;
2205 else
2206 retval = -ERESTARTSYS;
2207#else
2208 retval = -EAGAIN;
2209#endif
2210 break;
2211 }
2212
2213 serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
2214 if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
2215 do_clocal = 1;
2216
2217 if (!(info->flags & ASYNC_CLOSING) &&
2218 (do_clocal))
2219 break;
2220 if (signal_pending(current)) {
2221 retval = -ERESTARTSYS;
2222 break;
2223 }
2224#ifdef SERIAL_DEBUG_OPEN
2225 printk("block_til_ready blocking: ttys%d, count = %d\n",
2226 info->line, info->count);
2227#endif
2228 spin_unlock_irqrestore(&info->lock, flags);
2229 schedule();
2230 spin_lock_irqsave(&info->lock, flags);
2231 }
2232 set_current_state(TASK_RUNNING);
2233 remove_wait_queue(&info->open_wait, &wait);
2234 if (!tty_hung_up_p(filp))
2235 info->count++;
2236 info->blocked_open--;
2237 spin_unlock_irqrestore(&info->lock, flags);
2238#ifdef SERIAL_DEBUG_OPEN
2239 printk("block_til_ready after blocking: ttys%d, count = %d\n",
2240 info->line, info->count);
2241#endif
2242 if (retval)
2243 return retval;
2244 info->flags |= ASYNC_NORMAL_ACTIVE;
2245 return 0;
2246}
2247
2248/*
2249 * This routine is called whenever a serial port is opened. It
2250 * enables interrupts for a serial port, linking in its async structure into
2251 * the IRQ chain. It also performs the serial-specific
2252 * initialization for the tty structure.
2253 */
2254static int esp_open(struct tty_struct *tty, struct file * filp)
2255{
2256 struct esp_struct *info;
2257 int retval, line;
2258 unsigned long flags;
2259
2260 line = tty->index;
2261 if ((line < 0) || (line >= NR_PORTS))
2262 return -ENODEV;
2263
2264 /* find the port in the chain */
2265
2266 info = ports;
2267
2268 while (info && (info->line != line))
2269 info = info->next_port;
2270
2271 if (!info) {
2272 serial_paranoia_check(info, tty->name, "esp_open");
2273 return -ENODEV;
2274 }
2275
2276#ifdef SERIAL_DEBUG_OPEN
2277 printk("esp_open %s, count = %d\n", tty->name, info->count);
2278#endif
2279 spin_lock_irqsave(&info->lock, flags);
2280 info->count++;
2281 tty->driver_data = info;
2282 info->tty = tty;
2283
5552c28f 2284 spin_unlock_irqrestore(&info->lock, flags);
1da177e4
LT		 2285
2286 /*
2287 * Start up serial port
2288 */
2289 retval = startup(info);
2290 if (retval)
2291 return retval;
2292
2293 retval = block_til_ready(tty, filp, info);
2294 if (retval) {
2295#ifdef SERIAL_DEBUG_OPEN
2296 printk("esp_open returning after block_til_ready with %d\n",
2297 retval);
2298#endif
2299 return retval;
2300 }
2301
2302#ifdef SERIAL_DEBUG_OPEN
2303 printk("esp_open %s successful...", tty->name);
2304#endif
2305 return 0;
2306}
2307
2308/*
2309 * ---------------------------------------------------------------------
2310 * espserial_init() and friends
2311 *
2312 * espserial_init() is called at boot-time to initialize the serial driver.
2313 * ---------------------------------------------------------------------
2314 */
2315
2316/*
2317 * This routine prints out the appropriate serial driver version
2318 * number, and identifies which options were configured into this
2319 * driver.
2320 */
2321
2322static inline void show_serial_version(void)
2323{
2324 printk(KERN_INFO "%s version %s (DMA %u)\n",
2325 serial_name, serial_version, dma);
2326}
2327
2328/*
2329 * This routine is called by espserial_init() to initialize a specific serial
2330 * port.
2331 */
2332static inline int autoconfig(struct esp_struct * info)
2333{
2334 int port_detected = 0;
2335 unsigned long flags;
2336
2337 if (!request_region(info->port, REGION_SIZE, "esp serial"))
2338 return -EIO;
2339
2340 spin_lock_irqsave(&info->lock, flags);
2341 /*
2342 * Check for ESP card
2343 */
2344
2345 if (serial_in(info, UART_ESI_BASE) == 0xf3) {
2346 serial_out(info, UART_ESI_CMD1, 0x00);
2347 serial_out(info, UART_ESI_CMD1, 0x01);
2348
2349 if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
2350 port_detected = 1;
2351
2352 if (!(info->irq)) {
2353 serial_out(info, UART_ESI_CMD1, 0x02);
2354
2355 if (serial_in(info, UART_ESI_STAT1) & 0x01)
2356 info->irq = 3;
2357 else
2358 info->irq = 4;
2359 }
2360
2361
2362 /* put card in enhanced mode */
2363 /* this prevents access through */
2364 /* the "old" IO ports */
2365 esp_basic_init(info);
2366
2367 /* clear out MCR */
2368 serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
2369 serial_out(info, UART_ESI_CMD2, UART_MCR);
2370 serial_out(info, UART_ESI_CMD2, 0x00);
2371 }
2372 }
2373 if (!port_detected)
2374 release_region(info->port, REGION_SIZE);
2375
2376 spin_unlock_irqrestore(&info->lock, flags);
2377 return (port_detected);
2378}
2379
b68e31d0 2380static const struct tty_operations esp_ops = {
1da177e4
LT		 2381 .open = esp_open,
2382 .close = rs_close,
2383 .write = rs_write,
2384 .put_char = rs_put_char,
2385 .flush_chars = rs_flush_chars,
2386 .write_room = rs_write_room,
2387 .chars_in_buffer = rs_chars_in_buffer,
2388 .flush_buffer = rs_flush_buffer,
2389 .ioctl = rs_ioctl,
2390 .throttle = rs_throttle,
2391 .unthrottle = rs_unthrottle,
2392 .set_termios = rs_set_termios,
2393 .stop = rs_stop,
2394 .start = rs_start,
2395 .hangup = esp_hangup,
2396 .break_ctl = esp_break,
2397 .wait_until_sent = rs_wait_until_sent,
2398 .tiocmget = esp_tiocmget,
2399 .tiocmset = esp_tiocmset,
2400};
2401
2402/*
2403 * The serial driver boot-time initialization code!
2404 */
2405static int __init espserial_init(void)
2406{
2407 int i, offset;
2408 struct esp_struct * info;
2409 struct esp_struct *last_primary = NULL;
2410 int esp[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380};
2411
2412 esp_driver = alloc_tty_driver(NR_PORTS);
2413 if (!esp_driver)
2414 return -ENOMEM;
2415
2416 for (i = 0; i < NR_PRIMARY; i++) {
2417 if (irq[i] != 0) {
2418 if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
2419 (irq[i] == 8) || (irq[i] == 13))
2420 irq[i] = 0;
2421 else if (irq[i] == 2)
2422 irq[i] = 9;
2423 }
2424 }
2425
2426 if ((dma != 1) && (dma != 3))
2427 dma = 0;
2428
2429 if ((rx_trigger < 1) || (rx_trigger > 1023))
2430 rx_trigger = 768;
2431
2432 if ((tx_trigger < 1) || (tx_trigger > 1023))
2433 tx_trigger = 768;
2434
2435 if ((flow_off < 1) || (flow_off > 1023))
2436 flow_off = 1016;
2437
2438 if ((flow_on < 1) || (flow_on > 1023))
2439 flow_on = 944;
2440
2441 if ((rx_timeout < 0) || (rx_timeout > 255))
2442 rx_timeout = 128;
2443
2444 if (flow_on >= flow_off)
2445 flow_on = flow_off - 1;
2446
2447 show_serial_version();
2448
2449 /* Initialize the tty_driver structure */
2450
2451 esp_driver->owner = THIS_MODULE;
2452 esp_driver->name = "ttyP";
1da177e4
LT		 2453 esp_driver->major = ESP_IN_MAJOR;
2454 esp_driver->minor_start = 0;
2455 esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
2456 esp_driver->subtype = SERIAL_TYPE_NORMAL;
2457 esp_driver->init_termios = tty_std_termios;
2458 esp_driver->init_termios.c_cflag =
2459 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2460 esp_driver->flags = TTY_DRIVER_REAL_RAW;
2461 tty_set_operations(esp_driver, &esp_ops);
2462 if (tty_register_driver(esp_driver))
2463 {
2464 printk(KERN_ERR "Couldn't register esp serial driver");
2465 put_tty_driver(esp_driver);
2466 return 1;
2467 }
2468
2469 info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL);
2470
2471 if (!info)
2472 {
2473 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2474 tty_unregister_driver(esp_driver);
2475 put_tty_driver(esp_driver);
2476 return 1;
2477 }
2478
2479 memset((void *)info, 0, sizeof(struct esp_struct));
8f56a31a 2480 spin_lock_init(&info->lock);
1da177e4
LT		 2481 /* rx_trigger, tx_trigger are needed by autoconfig */
2482 info->config.rx_trigger = rx_trigger;
2483 info->config.tx_trigger = tx_trigger;
2484
2485 i = 0;
2486 offset = 0;
2487
2488 do {
2489 info->port = esp[i] + offset;
2490 info->irq = irq[i];
2491 info->line = (i * 8) + (offset / 8);
2492
2493 if (!autoconfig(info)) {
2494 i++;
2495 offset = 0;
2496 continue;
2497 }
2498
2499 info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
2500 info->flags = STD_COM_FLAGS;
2501 if (info->custom_divisor)
2502 info->flags |= ASYNC_SPD_CUST;
2503 info->magic = ESP_MAGIC;
2504 info->close_delay = 5*HZ/10;
2505 info->closing_wait = 30*HZ;
c4028958
DH		 2506 INIT_WORK(&info->tqueue, do_softint);
2507 INIT_WORK(&info->tqueue_hangup, do_serial_hangup);
1da177e4
LT		 2508 info->config.rx_timeout = rx_timeout;
2509 info->config.flow_on = flow_on;
2510 info->config.flow_off = flow_off;
2511 info->config.pio_threshold = pio_threshold;
2512 info->next_port = ports;
2513 init_waitqueue_head(&info->open_wait);
2514 init_waitqueue_head(&info->close_wait);
2515 init_waitqueue_head(&info->delta_msr_wait);
2516 init_waitqueue_head(&info->break_wait);
1da177e4
LT		 2517 ports = info;
2518 printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
2519 info->line, info->port, info->irq);
2520
2521 if (info->line % 8) {
2522 printk("secondary port\n");
2523 /* 8 port cards can't do DMA */
2524 info->stat_flags |= ESP_STAT_NEVER_DMA;
2525
2526 if (last_primary)
2527 last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
2528 } else {
2529 printk("primary port\n");
2530 last_primary = info;
2531 irq[i] = info->irq;
2532 }
2533
2534 if (!dma)
2535 info->stat_flags |= ESP_STAT_NEVER_DMA;
2536
2537 info = kmalloc(sizeof(struct esp_struct), GFP_KERNEL);
2538 if (!info)
2539 {
2540 printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
2541
2542 /* allow use of the already detected ports */
2543 return 0;
2544 }
2545
2546 memset((void *)info, 0, sizeof(struct esp_struct));
2547 /* rx_trigger, tx_trigger are needed by autoconfig */
2548 info->config.rx_trigger = rx_trigger;
2549 info->config.tx_trigger = tx_trigger;
2550
2551 if (offset == 56) {
2552 i++;
2553 offset = 0;
2554 } else {
2555 offset += 8;
2556 }
2557 } while (i < NR_PRIMARY);
2558
2559 /* free the last port memory allocation */
2560 kfree(info);
2561
2562 return 0;
2563}
2564
2565static void __exit espserial_exit(void)
2566{
2567 int e1;
2568 struct esp_struct *temp_async;
2569 struct esp_pio_buffer *pio_buf;
2570
2571 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2572 if ((e1 = tty_unregister_driver(esp_driver)))
2573 printk("SERIAL: failed to unregister serial driver (%d)\n",
2574 e1);
2575 put_tty_driver(esp_driver);
2576
2577 while (ports) {
2578 if (ports->port) {
2579 release_region(ports->port, REGION_SIZE);
2580 }
2581 temp_async = ports->next_port;
2582 kfree(ports);
2583 ports = temp_async;
2584 }
2585
2586 if (dma_buffer)
2587 free_pages((unsigned long)dma_buffer,
2588 get_order(DMA_BUFFER_SZ));
2589
1da177e4
LT		 2590 while (free_pio_buf) {
2591 pio_buf = free_pio_buf->next;
2592 kfree(free_pio_buf);
2593 free_pio_buf = pio_buf;
2594 }
2595}
2596
2597module_init(espserial_init);
2598module_exit(espserial_exit);
Clone of davem's net-next-2.6 tree